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Issue 26, 2017
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Insight into the polymerization mechanism of photoinduced step transfer-addition & radical-termination (START) polymerizations

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Abstract

Photoinduced step transfer-addition & radical-termination (START) polymerization is a newly developed polymerization strategy for the preparation of perfluorocarbon-containing alternating copolymers and was carried out under irradiation with blue light emitting diodes (LEDs) at room temperature (25 °C). In this work, the polymerization efficiency was further enhanced through optimization of the solvent system and construction of an efficient catalytic system: Ru(bpy)3Cl2/reducing agent (RA). In dimethyl carbonate (DMC)/acetonitrile (MeCN), the polyaddition between α,ω-diiodoperfluoroalkanes A and α,ω-unconjugated dienes B predominated over the chain transfer reaction, generating the target polymer product (AB)n with a relatively high molecular weight. Detailed analyses of a template reaction revealed the intrinsic polymerization mechanism of the START process. Based on a comprehensive investigation of the polymerization process, guidelines for the selection of appropriate RAs (e.g., L(+)-ascorbic acid sodium salt (AsAc-Na) and Fe(0)) are provided herein.

Graphical abstract: Insight into the polymerization mechanism of photoinduced step transfer-addition & radical-termination (START) polymerizations

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Publication details

The article was received on 26 Apr 2017, accepted on 13 Jun 2017 and first published on 13 Jun 2017


Article type: Paper
DOI: 10.1039/C7PY00709D
Citation: Polym. Chem., 2017,8, 3910-3920
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    Insight into the polymerization mechanism of photoinduced step transfer-addition & radical-termination (START) polymerizations

    T. Xu, L. Zhang, Z. Cheng and X. Zhu, Polym. Chem., 2017, 8, 3910
    DOI: 10.1039/C7PY00709D

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